/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.xs.util;

import java.lang.reflect.Array;
import java.util.AbstractList;

import com.sun.org.apache.xerces.internal.xs.LSInputList;
import org.w3c.dom.ls.LSInput;

/**
 * Contains a list of LSInputs.
 *
 * @author Michael Glavassevich, IBM
 * @version $Id: LSInputListImpl.java,v 1.2 2010-10-26 23:01:04 joehw Exp $
 * @xerces.internal
 */
public final class LSInputListImpl extends AbstractList implements LSInputList {

  /**
   * An immutable empty list.
   */
  public static final LSInputListImpl EMPTY_LIST = new LSInputListImpl(new LSInput[0], 0);

  // The array to hold all data
  private final LSInput[] fArray;
  // Number of elements in this list
  private final int fLength;

  /**
   * Construct an LSInputList implementation
   *
   * @param array the data array
   * @param length the number of elements
   */
  public LSInputListImpl(LSInput[] array, int length) {
    fArray = array;
    fLength = length;
  }

  /**
   * The number of <code>LSInput</code>s in the list. The range of valid
   * child object indices is 0 to <code>length-1</code> inclusive.
   */
  public int getLength() {
    return fLength;
  }

  /**
   * Returns the <code>index</code>th item in the collection or
   * <code>null</code> if <code>index</code> is greater than or equal to
   * the number of objects in the list. The index starts at 0.
   *
   * @param index index into the collection.
   * @return The <code>LSInput</code> at the <code>index</code>th position in the
   * <code>LSInputList</code>, or <code>null</code> if the index specified is not valid.
   */
  public LSInput item(int index) {
    if (index < 0 || index >= fLength) {
      return null;
    }
    return fArray[index];
  }

    /*
     * List methods
     */

  public Object get(int index) {
    if (index >= 0 && index < fLength) {
      return fArray[index];
    }
    throw new IndexOutOfBoundsException("Index: " + index);
  }

  public int size() {
    return getLength();
  }

  public Object[] toArray() {
    Object[] a = new Object[fLength];
    toArray0(a);
    return a;
  }

  public Object[] toArray(Object[] a) {
    if (a.length < fLength) {
      Class arrayClass = a.getClass();
      Class componentType = arrayClass.getComponentType();
      a = (Object[]) Array.newInstance(componentType, fLength);
    }
    toArray0(a);
    if (a.length > fLength) {
      a[fLength] = null;
    }
    return a;
  }

  private void toArray0(Object[] a) {
    if (fLength > 0) {
      System.arraycopy(fArray, 0, a, 0, fLength);
    }
  }

} // LSInputListImpl
